V6035. Double negation is present in the expression: !!x.

Analyzer has detected a potential error related to double negation of a variable. Such duplication is confused, and, most likely, contains an error.

Consider the following example:

if (!(( !filter )))
{
....
}

This error most likely appeared during code refactoring. For example, a part of a complex logical expression was removed while the negation of the whole result wasn't. As a result, we've got an expression with an opposite meaning.